Use a different map to distinguish eval contexts

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index 57b976976c20f804b9e28d51ae8a55605a3e11c4..8a07976a66136e8576e514ab902baff6413ff88c 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -458,6 +458,18 @@ void JSGenericLowering::LowerJSCreateFunctionContext(Node* node) {
   }
 }
 
+void JSGenericLowering::LowerJSCreateEvalContext(Node* node) {
+  int const slot_count = OpParameter<int>(node->op());
+  CallDescriptor::Flags flags = FrameStateFlagForCall(node);
+
+  if (slot_count <= FastNewFunctionContextStub::kMaximumSlots) {
+    Callable callable = CodeFactory::FastNewEvalContext(isolate());
+    node->InsertInput(zone(), 1, jsgraph()->Int32Constant(slot_count));
+    ReplaceWithStubCall(node, callable, flags);
+  } else {
+    ReplaceWithRuntimeCall(node, Runtime::kNewEvalContext);
+  }
+}
 
 void JSGenericLowering::LowerJSCreateIterResultObject(Node* node) {
   ReplaceWithRuntimeCall(node, Runtime::kCreateIterResultObject);